eightcard/opencv-android

Android Library Project for OpenCV (currently v3.x.y)

Download

Step 1. Add the JitPack repository to your build file

Add it in your root settings.gradle at the end of repositories:

	dependencyResolutionManagement {
		repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
		repositories {
			mavenCentral()
			maven { url 'https://jitpack.io' }
		}
	}

Add it in your settings.gradle.kts at the end of repositories:

	dependencyResolutionManagement {
		repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
		repositories {
			mavenCentral()
			maven { url = uri("https://jitpack.io") }
		}
	}

Add to pom.xml

	<repositories>
		<repository>
		    <id>jitpack.io</id>
		    <url>https://jitpack.io</url>
		</repository>
	</repositories>

Add it in your build.sbt at the end of resolvers:

 
    resolvers += "jitpack" at "https://jitpack.io"

Add it in your project.clj at the end of repositories:

 
    :repositories [["jitpack" "https://jitpack.io"]]

Step 2. Add the dependency

	dependencies {
		implementation 'com.github.eightcard:OpenCV-Android:'
	}
	dependencies {
		implementation("com.github.eightcard:OpenCV-Android:")
	}
	<dependency>
	    <groupId>com.github.eightcard</groupId>
	    <artifactId>OpenCV-Android</artifactId>
	    <version></version>
	</dependency>

                            
    libraryDependencies += "com.github.eightcard" % "OpenCV-Android" % ""
        
        

                            
    :dependencies [[com.github.eightcard/OpenCV-Android ""]]

Readme

opencv-android

OpenCV4Android, packaged as a .aar for direct use without depending on the stupid OpenCV Manager app.

Building an .aar of OpenCV-3.x.y

Building OpenCV-3.x.y for Android is actually quite simple, its just not obvious where to get the pieces and the OpenCV docs hard-sell the "OpenCV Manager" in favour of the better and easier direct integration approach.

Here's the steps I used to create my .aar:

  1. Download and extract the OpenCV4Android bundle
  2. Create a Library Project in Android Studio
  3. Copy the java source files from OpenCV4Android into src/main/java
  4. Drop the OpenCV native libraries into src/main/jniLibs
  5. Run the gradle build
  6. Et voila, .aar file

install

Reference the maven repository

repositories {
    maven { url 'https://github.com/eightcard/opencv-android/raw/master/maven-repo' }
}

Include the .aar in your build.gradle file:

dependencies {
    compile 'com.github.eightcard:OpenCV-Android:3.2.0'
}

Bootstrap OpenCV in your Java code:

import org.opencv.android.OpenCVLoader;

...

if (OpenCVLoader.initDebug()) {
  // do some opencv stuff
}

Optional but recommended: to keep the downloaded APK size to a minimum, build separate APK's per architecture (approx 10MB each vs 42MB for universal) by placing the following inside the 'android' gradle directive of your application's build.gradle:

splits {
  abi {
    enable true
    reset()
    include 'x86', 'x86_64', 'armeabi', 'armeabi-v7a', 'mips', 'mips64', 'arm64-v8a'
    universalApk false
  }
}

Disclaimer: This project is simply my bundling of OpenCV as an Android Library. I am not otherwise involved in the OpenCV project, and all credit for the wonderful OpenCV library goes to the developers thereof.